Robes of the Disciple

"Heavy and warm, disciple robes typically denote a fervent (and some would say unhealthy) dedication to one school or another. These robes bear the insignia of <school> and will give bonuses to spells in that school."

Robes of the Disciple are dedicated to a certain school, they change their color depending on which level you achieved in that school. Also, they add a small bonus to the spells of the school.